docs: def delete(self, id):
          """Delete run by id"""
          run = self.backend_store.get_run(id)
          if not run:
              return abort(http_client.NOT_FOUND,
                           message="Run {} doesn't exist".format(id))
          if not self.manager.delete_run(run):
              return abort(http_client.BAD_REQUEST,
                           message="Failed to find the task queue "
                                   "manager of run {}.".format(id))
          return '', http_client.NO_CONTENT